| http://www.w3.org/ns/prov#value | - A still further aspect of the present invention is a cannula for use with an obturator, the cannula including a cylindrical tube having a first end and a second end; a head assembly mounted to the first end of the cylindrical tube; and a resilient sealing element mounted in the head assembly having at least one aperture; whereby when the obturator is inserted into the cannula, the obturator passes
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